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It's a 1978 USA carb.
JimC=The Michael Jordan of Aisin Carbs.
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He's just saying this to launch me off on the whole Aisan fuel systems vs. Aisin Sieki drivetrain components tangent....![]()
One other issue I've experience after the desmog, and head replacement: after i turn the truck off, the fan on Driver fender continues to run. Is this normal? She's been sitting a while but i don't remember that before.
The HIC valve does control the HAI for faster warmup. The HIC also provides (as the name indicates) Hot Idle Compensation, raising the idle speed when engine bay temps are high, to help turn the fan & WP faster and cool things off. So, if the HAI is undesirable, just cap off the HAI vac nipple on the HIC valve. HAI will be disabled, but the HIC function will remain.
The crankcase breather is a 90* rubber hose from valve cover to air cleaner.